<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>4_createRef的使用</title>
</head>
<body>	
    <!-- 准备好一个“容器” -->
	<div id="test"></div>
	
	<!-- 引入react核心库 -->
	<script type="text/javascript" src="../js/react.development.js"></script>
	<!-- 引入react-dom，用于支持react操作DOM -->
	<script type="text/javascript" src="../js/react-dom.development.js"></script>
	<!-- 引入babel，用于将jsx转为js -->
	<script type="text/javascript" src="../js/babel.min.js"></script>
    <script type="text/babel">
        class Demo extends React.Component{
            myRef=React.createRef()
            myRef2=React.createRef()
            showData= () => {
                alert(this.myRef.current.value)
            }
            showData2 = () => {
                alert(this.myRef2.current.value)
            }
           render(){
            return (
                <div>
                    <input ref={this.myRef} type="text" placeholder="点击按钮提示数据"/>&nbsp;
                    <button onClick={this.showData}>点我提示左侧的数据</button>&nbsp;
                    <input onBlur={this.showData2} ref={this.myRef2} type="text" placeholder="失去焦点提示数据"/>&nbsp;
                    </div>
            )
           }
        }
        ReactDOM.render(<Demo />,document.getElementById('test'))
    </script>
    
</body>
</html>